%% options copyright owner = Dirk Krause copyright year = 2015-xxxx license = bsd %% header /** @file String recoding from UTF-16 to ASCII. CRT on Windows: Not used. */ #ifndef DK4CONF_H_INCLUDED #include "dk4conf.h" #endif #ifndef DK4TYPES_H_INCLUDED #include "dk4types.h" #endif #ifndef DK4ERROR_H_INCLUDED #include "dk4error.h" #endif #ifdef __cplusplus extern "C" { #endif /** Recode string from UTF-16 to ASCII. @param dstb Destination buffer. @param szdstb Size of destination buffer (number of bytes). @param src Source string to convert. @param erp Error report, may be NULL. @return 1 on success, 0 on error. Error codes: - DK4_E_INVALID_ARGUMENTS
if src or dstb is NULL or szdstb is 0, - DK4_E_BUFFER_TOO_SMALL
if dstb is too small, - DK4_E_SYNTAX
with the number of successfully recoded characters in nelem if a non-recodable character was found. */ int dk4recode_utf16_to_ascii( char *dstb, size_t szdstb, const dk4_c16_t *src, dk4_er_t *erp ); #ifdef __cplusplus } #endif %% module #include "dk4rec08.h" #include "dk4mem.h" #include "dk4utf16.h" int dk4recode_utf16_to_ascii( char *dstb, size_t szdstb, const dk4_c16_t *src, dk4_er_t *erp ) { dk4_utf16_decoder_t dec; size_t used = 0; size_t rd = 0; dk4_c32_t c32 = dkC32(0); int back = 0; if ((NULL != dstb) && (NULL != src) && (0 < szdstb)) { back = 1; dk4utf16_init(&dec); while(((dk4_c16_t)0U != *src) && (1 == back) && (used < szdstb)) { switch(dk4utf16_add(&dec, *(src++))) { case DK4_EDSTM_FINISHED: { c32 = dk4utf16_get(&dec); dk4utf16_init(&dec); if (dkC32(0x00000100) > c32) { dstb[used++] = (char)c32; } else { back = 0; dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd); } } break; case DK4_EDSTM_ERROR: { back = 0; dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd); } break; } if (0 != back) { rd++; } } if (used < szdstb) { dstb[used] = '\0'; } else { dstb[szdstb - 1] = '\0'; back = 0; dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL); } if (0 == dk4utf16_is_empty(&dec)) { back = 0; dk4error_set_elsize_nelem(erp, DK4_E_SYNTAX, 2, rd); } } else { dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS); } return back; }